"រ" meaning in Khmer

{
  "forms": [
    {
      "form": "រ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "្រ",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "rɔɔ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "",
        "head": "រ, ្រ"
      },
      "expansion": "រ, ្រ • (rɔɔ)",
      "name": "km-letter"
    }
  ],
  "lang": "Khmer",
  "lang_code": "km",
  "pos": "character",
  "senses": [
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        {
          "_dis": "86 14",
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        }
      ],
      "glosses": [
        "twenty-seventh letter of the Cambodian alphabet"
      ],
      "id": "en-រ-km-character-nZdWBNHf",
      "links": [
        [
          "letter",
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      "tags": [
        "letter"
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  "word": "រ"
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      "form": "rɔɔ",
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  ],
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    {
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      "expansion": "រ • (rɔɔ)",
      "name": "km-noun"
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  "lang": "Khmer",
  "lang_code": "km",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "fence, picket"
      ],
      "id": "en-រ-km-noun-mj66OF-v",
      "links": [
        [
          "fence",
          "fence"
        ],
        [
          "picket",
          "picket"
        ]
      ],
      "related": [
        {
          "roman": "cɑmnaa",
          "word": "ចំណារ"
        }
      ]
    }
  ],
  "word": "រ"
}

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  "forms": [
    {
      "form": "រ",
      "tags": [
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    },
    {
      "form": "្រ",
      "tags": [
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    },
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      "form": "rɔɔ",
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      ]
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  ],
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      "args": {
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      "name": "km-letter"
    }
  ],
  "lang": "Khmer",
  "lang_code": "km",
  "pos": "character",
  "senses": [
    {
      "glosses": [
        "twenty-seventh letter of the Cambodian alphabet"
      ],
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        [
          "letter",
          "letter"
        ]
      ],
      "tags": [
        "letter"
      ]
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  ],
  "word": "រ"
}

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  "categories": [
    "Khmer entries with incorrect language header",
    "Khmer entries with language name categories using raw markup",
    "Khmer lemmas",
    "Khmer letters",
    "Khmer nouns",
    "Khmer o-series consonants",
    "Khmer one-letter words",
    "Khmer terms with IPA pronunciation",
    "Khmer terms with non-redundant manual transliterations",
    "Khmer terms with redundant script codes"
  ],
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  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "រ • (rɔɔ)",
      "name": "km-noun"
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  "lang": "Khmer",
  "lang_code": "km",
  "pos": "noun",
  "related": [
    {
      "roman": "cɑmnaa",
      "word": "ចំណារ"
    }
  ],
  "senses": [
    {
      "glosses": [
        "fence, picket"
      ],
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        [
          "fence",
          "fence"
        ],
        [
          "picket",
          "picket"
        ]
      ]
    }
  ],
  "word": "រ"
}